工程陶瓷超声振动辅助下的预压应力压痕试验

提出了一种超声振动辅助加工下的预压应力压痕试验，采用ZrO₂、95% Al₂O₃、SiC工程陶瓷作为试验材料，研究外部载荷对材料的加工损伤影响机理。结果表明，在无预压应力压痕过程中，3种材料的加工损伤表现出不同的形式，如径向裂纹、边缘破损和微裂纹；在预压应力压痕过程中，不论是相同法向负载还是相同压痕深度条件下，上述材料的加工损伤都受到了不同程度的抑制，同时证实了预压应力会加大压痕过程的法向力，减小压痕深度。在超声振动辅助下的预压应力压痕试验过程中，由于超声振动的作用机理，有效减小了压痕过程的法向力、增大了压痕深度，有利于工程陶瓷的高效低损伤加工。

Compressive Prestress Indentation Experiments of Engineering Ceramic Under Ultrasonic Virbration

To explore the machining damage mechanisms of engineering ceramics under the effect of the external loads. Ultrasonic assisted indentation experiments of engineering ceramics under compressive pre-stress which performed with the materials of ZrO₂, 95% Al₂O₃ and SiC ceramics were proposed. Experimental results show that the machining damages of three materials present different forms during the indentation process without compressive pre-stress, respectively, such as radial crack, edge fracture and micro cracks. However, in the indentation process under compressive prestress, the machining damages are restrained when the sample manufactured with the same condition. Meanwhile, the normal forces increase and the indentation depths decrease. Moreover, in the ultrasonic assisted indentation process under compressive prestress, the normal forces decrease effectively and the indentation depths increase due to the effect of ultrasonic vibration. Hence, this machining method can make the engineering ceramic manufacture with high efficiency and a few machining damages retained.